Reference service for collections that has '/' in key name doesn't work

[wgyalpo]

The below request returns Bad request
https://services.odata.org/V3/Northwind/Northwind.svc/Products_by_Categories(CategoryName='Meat%2FPoultry',Discontinued=false,ProductName='Tourti%C3%A8re')

But the same done through filter works fine.

https://services.odata.org/V3/Northwind/Northwind.svc/Products_by_Categories?$filter=CategoryName eq 'Meat%2FPoultry' and Discontinued eq false and ProductName eq 'Tourtière'

[grenik]

Same with TripPin:

POST https://services.odata.org/TripPinRESTierService/(S(310gyzdbxdisbt4f0itnsc5o))/Airports
Content-Type: application/json

{"Name":"Slasher","IcaoCode":"_\/\/","IataCode":"_\/"}

returns the newly created entity

GET https://services.odata.org/TripPinRESTierService/(S(310gyzdbxdisbt4f0itnsc5o))/Airports('_%2F%2F')

throws HTTP 500 "The page cannot be displayed because an internal server error has occurred."

GET https://services.odata.org/TripPinRESTierService/(S(310gyzdbxdisbt4f0itnsc5o))/Airports?$filter=IcaoCode eq '_%2F%2F'

returns the entity